rt-table

#!/bin/bash
#set -x

table=$1
# may be omitted
mode=$2

test -z "$table" && echo "No table number given" && exit 1
test -z "$IFACE" && echo "IFACE not specified" && exit 2

# Get ip address, if not specified (dhcp or ppp may have dynamicaly-assigned address)
get_ipaddr() {
if [ -z "$IP_ADDRESS" ]; then
	IP_ADDRESS=$(ip addr show $IFACE | egrep 'inet[^6]' | head -1 | tr -s ' ' | cut -d' ' -f 3 | cut -d/ -f1)
fi
if [ -z "$IP_ADDRESS" ]; then
	echo "Failed to get ip address"
	return 1;
else return 0;
fi
}

# Clear rules and table
clear_rt() {
ip rule list | fgrep "lookup $table" | cut -d: -f 2 | while read i; do
	ip rule del $i
done
ip route flush table $table
}

# Create rules and table
create_rt() {
ip route show dev $IFACE | while read i; do
	ip route add $i dev $IFACE table $table
	echo $?
done
ip rule add from $IP_ADDRESS lookup $table
}

if [ "$mode" = "down" ]; then
	clear_rt
else
	get_ipaddr || exit 3
	clear_rt
	create_rt
fi

exit 0